51240750 has 64 divisors (see below), whose sum is σ = 139546368. Its totient is φ = 12420000.

The previous prime is 51240731. The next prime is 51240751. The reversal of 51240750 is 5704215.

It is a super-2 number, since 2×51240750² = 5251228921125000, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51240750.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51240751) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5145 + ... + 11355.

It is an arithmetic number, because the mean of its divisors is an integer number (2180412).

Almost surely, 2^51240750 is an apocalyptic number.

51240750 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51240750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69773184).

51240750 is an abundant number, since it is smaller than the sum of its proper divisors (88305618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51240750 is a wasteful number, since it uses less digits than its factorization.

51240750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6242 (or 6232 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 51240750 is about 7158.2644544610. The cubic root of 51240750 is about 371.4255934532.

Adding to 51240750 its reverse (5704215), we get a palindrome (56944965).

The spelling of 51240750 in words is "fifty-one million, two hundred forty thousand, seven hundred fifty".